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tim mot phan so bang phan so 3/4 biet rang neu lay tu so cua phan so do cong voi nam thi duoc phan so bang 4/5
tim mot so biet so do cong voi 10 roi tru 20 roi lai cong voi 60 thi bang 90 so do la ...
An ngi ra mot so lay so do cong voi 43 roi tru 11 thi bang so lon nhat co hai chu so
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Tim mot so co 2 chu so, biet rang khi viet them chu so 4 vao ben trai so do ta duoc mot so gap chin lan so phai tim
tim mot so co hai chu so biet hieu cua chu so hang chuc va chu so hang don vi bang 5 va tich cua hai chu so bang 24
tim so tu nhien co 2 chu so biet rang tong cac chu so bang 7 tich cac chu so bang 10. giai day du dc 1 like
mot xuong san xuat co so cong nhan nam gap 4 lan so cong nhan nu.hoi suong do co bao nhieu cong nhan nam,bao nhieu cong nhan nu,biet rang tong so cong nhan lon hon 40 va be hon 50?
Tim so be nhat co 2 chu so .Biet hai chu so cua so tru cho nhau thi bang 2
tim so tu nhien co 3 chu so biet rang khi chia so do cho 17 thi duoc so du la 8 con chia so do cho 25 thi duoc so du la 16